Rob Goff wrote:

Well, the Bogle family papers may not have given us any information about Alexander's family; but, the papers of William Cuningham and Co. might. This was one of the companies that Robert Bogle was a partner in and was also the foremost of the Glasgow firms involved in Virginia. These can be found in the National Archives of Scotland with one letterbook held privately (I believe that it is in the possession of the Cunningham family). It appears that these are correspondence with both agents and customers in Virginia. There are some other papers held at the Virginia Historical Society.

Steve here: I'm getting Alison moving on this new direction asap.